B.TECH. (AEROSPACE ENGINEERING) PROGRAM (BTAE) Term-End Examination December, 2011 BAS-007 : CNS - ATM SYSTEMS
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Time : 3 hours Note :
Maximum Marks : 70
Answer any seven questions, in total. Out of which Questions 4 and 5 are compulsory.
1.
Define Amplitude Modulation. Derive an expression for modulation index in case of AM.
2.
(a) What are the limitations to NDB 4 functioning ? (b) A 400 W carrier is amplitude modulated to 4 a depth of 75%. Calculate the total power in the modulated wave.
3.
Write short notes on any four : (a)
DME
(b)
ATU
(c)
Bandwidth of AM signal
(d)
SRE
(e)
Naystar GPS receiver
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2x4=8
P.T.O.
4.
What do the following terms stand for ? 1x12=12 (a)
ICAO
(b)
RNP
(c)
HSI
(d)
TACAN
(e)
MLS
(f)
GLONASS
(g)
IFR
(h)
IFF
(i)
VMC
(j)
GAGAN
(k)
PAPI
(1)
RADAR
5. Explain any six of the following : 6x3=18 (a)
EM spectrum (b) Airway
(c)
Transponder (d) Homing
(e) Windsock (f) Marker beacons
6.
(g)
Controlled airspace
(h)
Runway threshold
Explain the functioning of DME with the help of
8
a block diagram.
7. (a) Explain the fundamentals of MTI in a 4 radar. (b)
What is the duty cycle of a radar with a 4 pulse width of 3 p.sec and a pulse repitition time of 6 msec ?
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8.
Explain the operation of PAR in aiding ground 8 controlled approach.
9.
(a) What is AAI ? What are the functions of 4 AAI ? (b) What are the actions to be taken by an ATC 4 unit in case of an emergency descent of aircraft ?
